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PC 111 Catalog No. 534-767 Printed in U.S.A. Form 48HJ-18SI Pg 1 9-00 Replaces: 48HJ-17SI
Book 1 4
Ta b 1 a 6 a
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1
•ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork. . . . . . . . . . . . . . . 3
Step 3 — Install External Trap for
Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 3
• POSITIONING
Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . . 4
Step 6 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . 4
Step 7 — Make Electrical Connections . . . . . . . . . . . 4
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 8 — Adjust Factory-Installed Options . . . . . . . 8
• MOISTUREMISER DEHUMIDIFCATION
PACKAGE
• APOLLO CONTROL
• DISCONNECT SWITCH
• OPTIONAL DURABLADE ECONOMIZER
• OPTIONAL ECONOMI$ER
Step 9 — Adjust Evaporator-Fan Speed . . . . . . . . . 19
• BELT-DRIVE MOTORS
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-38
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 39-45
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
INSTALLATION
Unit is shipped in the vertical discharge configuration. To
convert to horizontal discharge application, remove duct open-
ing covers. Using the same screws, install covers on duct open-
ings in basepan of unit with insulation-side down. Seals around
openings must be tight.
NOTE: Any combination of supply and return ducting is per-
missible, i.e., vertical supply combined with horizontal return.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb in
accordance with instructions shipped with curb. See Fig. 1. In-
stall insulation, cant strips, roofing felt, and counter flashing as
shown.
Ductwork must be attached to curb, not to the unit.
If electric control power or gas service is to be routed through
the basepan, attach the accessory thru-the-bottom service con-
nections to the basepan in accordance with the accessory instal-
lation instructions. Connections must be installed before unit is
set on roof curb.
Curb should be level. Unit leveling tolerances are shown in
Fig. 2. This is necessary for unit drain to function properly. Re-
fer to Accessory Roof Curb Installation Instructions for addi-
tional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 6 in. beyond unit cab-
inet. Install a gravel apron in front of condenser-coil air inlet to
prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lockout
tag. Ensure electrical service to rooftop unit agrees with
voltage and amperage listed on the unit rating plate. Elec-
trical shock could cause personal injury.
Disconnect gas piping from unit when leak
testing at pressure greater than
1
/
2
psig. Pres-
sures greater than
1
/
2
psig will cause gas valve
damage resulting in hazardous condition. If
gas valve is subjected to pressure greater than
1
/
2
psig, it
must
be replaced before use. When
pressure testing field-supplied gas piping at
pressures of
1
/
2
psig or less, a unit connected
to such piping must be isolated by manually
closing the gas valve(s).
IMPORTANT: The gasketing of the unit to the roof curb
is critical for a watertight seal. Install gasket supplied
with the roof curb as shown in Fig. 1. Improperly
applied gasket can result in air leaks and poor unit
performance.
48HJD005-007, 48HJE/HJF004-007
48HJL/HJM/HJN/HJG/HJH/HJK004-006 (LOW NO
x
)
Single-Package Rooftop Heating/Cooling